Remember this is from an old loading manual and I would be doubtful as to the actual test methods. I'd consider these loads as something you'd want to approach cautiously but most apparently they were safe for the materials available at the time. This manual is from the 1920's, use at your own risk. But if it were my shooter and an old rifle, I'd be looking at 1290'ps loading and skip trying to make it into a hot rod. Might take a look at the 100 gr Remington bullet for your jacketed loads as it looks like it's made just for this oldie.